summaryrefslogtreecommitdiff
path: root/src
diff options
context:
space:
mode:
Diffstat (limited to 'src')
-rw-r--r--src/libxineadec/Makefile.am6
-rw-r--r--src/libxineadec/logpcm.c278
-rw-r--r--src/xine-engine/buffer.h4
-rw-r--r--src/xine-engine/buffer_types.c20
4 files changed, 305 insertions, 3 deletions
diff --git a/src/libxineadec/Makefile.am b/src/libxineadec/Makefile.am
index baf5dd5ee..bc1efd95c 100644
--- a/src/libxineadec/Makefile.am
+++ b/src/libxineadec/Makefile.am
@@ -4,7 +4,8 @@
libdir = $(XINE_PLUGINDIR)
-lib_LTLIBRARIES = xineplug_decode_roqaudio.la xineplug_decode_adpcm.la
+lib_LTLIBRARIES = xineplug_decode_roqaudio.la xineplug_decode_adpcm.la \
+ xineplug_decode_logpcm.la
xineplug_decode_roqaudio_la_SOURCES = roqaudio.c
xineplug_decode_roqaudio_la_LDFLAGS = -avoid-version -module
@@ -12,6 +13,9 @@ xineplug_decode_roqaudio_la_LDFLAGS = -avoid-version -module
xineplug_decode_adpcm_la_SOURCES = adpcm.c
xineplug_decode_adpcm_la_LDFLAGS = -avoid-version -module
+xineplug_decode_logpcm_la_SOURCES = logpcm.c
+xineplug_decode_logpcm_la_LDFLAGS = -avoid-version -module
+
# noinst_HEADERS =
debug:
diff --git a/src/libxineadec/logpcm.c b/src/libxineadec/logpcm.c
new file mode 100644
index 000000000..bb0dd92a8
--- /dev/null
+++ b/src/libxineadec/logpcm.c
@@ -0,0 +1,278 @@
+/*
+ * Copyright (C) 2000-2002 the xine project
+ *
+ * This file is part of xine, a free video player.
+ *
+ * xine is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * xine is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
+ *
+ * Logarithmic PCM Decoder
+ * This audio decoder handles the mu-law and A-law logarithmic coding
+ * standards.
+ *
+ * mu-law -> PCM conversion routine found at this site:
+ * http://www.speech.cs.cmu.edu/comp.speech/Section2/Q2.7.html
+ * and credited to this person:
+ * Craig Reese: IDA/Supercomputing Research Center
+ *
+ * mu-law -> PCM conversion routine lifted from SoX Sound eXchange:
+ * http://sox.sourceforge.net/
+ * which listed the code as being lifted from Sun Microsystems.
+ *
+ * $Id: logpcm.c,v 1.1 2002/09/01 04:24:35 tmmm Exp $
+ *
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <stdlib.h>
+#include <string.h>
+
+#include "audio_out.h"
+#include "buffer.h"
+#include "xine_internal.h"
+#include "xineutils.h"
+#include "bswap.h"
+
+#define AUDIOBUFSIZE 128*1024
+#define LOGPCM_BITS_PER_SAMPLE 16
+
+typedef struct logpcm_decoder_s {
+ audio_decoder_t audio_decoder;
+
+ int64_t pts;
+
+ ao_instance_t *audio_out;
+ int output_open;
+ int output_channels;
+
+ unsigned char *buf;
+ int bufsize;
+ int size;
+
+ short logtable[256];
+} logpcm_decoder_t;
+
+/*
+** This routine converts from ulaw to 16 bit linear.
+**
+** Craig Reese: IDA/Supercomputing Research Center
+** 29 September 1989
+**
+** References:
+** 1) CCITT Recommendation G.711 (very difficult to follow)
+** 2) MIL-STD-188-113,"Interoperability and Performance Standards
+** for Analog-to_Digital Conversion Techniques,"
+** 17 February 1987
+**
+** Input: 8 bit ulaw sample
+** Output: signed 16 bit linear sample
+*/
+
+static int mulaw2linear(unsigned char mulawbyte) {
+
+ static int exp_lut[8] = {0,132,396,924,1980,4092,8316,16764};
+ int sign, exponent, mantissa, sample;
+
+ mulawbyte = ~mulawbyte;
+ sign = (mulawbyte & 0x80);
+ exponent = (mulawbyte >> 4) & 0x07;
+ mantissa = mulawbyte & 0x0F;
+ sample = exp_lut[exponent] + (mantissa << (exponent + 3));
+ if (sign != 0) sample = -sample;
+
+ return(sample);
+}
+
+/*
+ * The following A-law -> PCM conversion function came from SoX which in
+ * turn came from Sun Microsystems.
+ */
+#define SIGN_BIT (0x80) /* Sign bit for a A-law byte. */
+#define QUANT_MASK (0xf) /* Quantization field mask. */
+#define SEG_SHIFT (4) /* Left shift for segment number. */
+#define SEG_MASK (0x70) /* Segment field mask. */
+
+/*
+ * alaw2linear() - Convert an A-law value to 16-bit signed linear PCM
+ *
+ */
+static int alaw2linear(unsigned char a_val) {
+
+ int t;
+ int seg;
+
+ a_val ^= 0x55;
+
+ t = (a_val & QUANT_MASK) << 4;
+ seg = ((unsigned)a_val & SEG_MASK) >> SEG_SHIFT;
+ switch (seg) {
+ case 0:
+ t += 8;
+ break;
+
+ case 1:
+ t += 0x108;
+ break;
+
+ default:
+ t += 0x108;
+ t <<= seg - 1;
+ }
+ return ((a_val & SIGN_BIT) ? t : -t);
+}
+
+
+static int logpcm_can_handle (audio_decoder_t *this_gen, int buf_type) {
+
+ return (buf_type == BUF_AUDIO_MULAW ||
+ buf_type == BUF_AUDIO_ALAW);
+
+}
+
+static void logpcm_reset (audio_decoder_t *this_gen) {
+}
+
+static void logpcm_init (audio_decoder_t *this_gen, ao_instance_t *audio_out) {
+
+ logpcm_decoder_t *this = (logpcm_decoder_t *) this_gen;
+
+ this->audio_out = audio_out;
+ this->output_open = 0;
+}
+
+static void logpcm_decode_data (audio_decoder_t *this_gen, buf_element_t *buf) {
+
+ logpcm_decoder_t *this = (logpcm_decoder_t *) this_gen;
+ audio_buffer_t *audio_buffer;
+ int in;
+ int i;
+ int bytes_to_send;
+
+ if (buf->decoder_flags & BUF_FLAG_HEADER) {
+
+ this->output_channels = buf->decoder_info[3];
+ this->buf = xine_xmalloc(AUDIOBUFSIZE);
+ this->bufsize = AUDIOBUFSIZE;
+ this->size = 0;
+
+ /* pre-calculate the possible log values */
+ if (buf->type == BUF_AUDIO_MULAW)
+ for (i = 0; i < 256; i++)
+ this->logtable[i] = (short)mulaw2linear(i);
+ else if (buf->type == BUF_AUDIO_ALAW)
+ for (i = 0; i < 256; i++)
+ this->logtable[i] = (short)alaw2linear(i);
+
+ return;
+ }
+
+ if (!this->output_open) {
+ this->output_open = this->audio_out->open(this->audio_out,
+ LOGPCM_BITS_PER_SAMPLE, buf->decoder_info[1],
+ (buf->decoder_info[3] == 2) ? AO_CAP_MODE_STEREO : AO_CAP_MODE_MONO);
+ }
+
+ /* if the audio still isn't open, bail */
+ if (!this->output_open)
+ return;
+
+ if( this->size + buf->size > this->bufsize ) {
+ this->bufsize = this->size + 2 * buf->size;
+ printf("logpcm: increasing source buffer to %d to avoid overflow.\n",
+ this->bufsize);
+ this->buf = realloc( this->buf, this->bufsize );
+ }
+
+ xine_fast_memcpy (&this->buf[this->size], buf->content, buf->size);
+ this->size += buf->size;
+
+ if (buf->decoder_flags & BUF_FLAG_FRAME_END) { /* time to decode a frame */
+
+ /* iterate through each 8-bit sample in the input buffer */
+ in = 0;
+ while (in < this->size) {
+
+ audio_buffer = this->audio_out->get_buffer (this->audio_out);
+ if (audio_buffer->mem_size == 0) {
+ printf ("adpcm: Help! Allocated audio buffer with nothing in it!\n");
+ return;
+ }
+
+ /* this->size and in are sample counts, mem_size is a byte count */
+ if ((this->size - in) > (audio_buffer->mem_size / 2))
+ bytes_to_send = audio_buffer->mem_size / 2;
+ else
+ bytes_to_send = this->size - in;
+
+ /* fill up this buffer */
+ for (i = 0; i < bytes_to_send; i++)
+ audio_buffer->mem[i] = this->logtable[this->buf[in++]];
+
+ audio_buffer->num_frames = bytes_to_send / this->output_channels;
+ audio_buffer->vpts = buf->pts;
+ buf->pts = 0; /* only first buffer gets the real pts */
+ this->audio_out->put_buffer (this->audio_out, audio_buffer);
+ }
+
+ /* reset internal accumulation buffer */
+ this->size = 0;
+ }
+}
+
+static void logpcm_close (audio_decoder_t *this_gen) {
+ logpcm_decoder_t *this = (logpcm_decoder_t *) this_gen;
+
+ if (this->output_open)
+ this->audio_out->close (this->audio_out);
+ this->output_open = 0;
+}
+
+static char *logpcm_get_id(void) {
+ return "Logarithmic PCM";
+}
+
+static void logpcm_dispose (audio_decoder_t *this_gen) {
+ free (this_gen);
+}
+
+audio_decoder_t *init_audio_decoder_plugin (int iface_version, xine_t *xine) {
+
+ logpcm_decoder_t *this;
+ if (iface_version != 9) {
+ printf(_("logpcm: plugin doesn't support plugin API version %d.\n"
+ "logpcm: this means there's a version mismatch between xine and this\n"
+ "logpcm: decoder plugin.\nInstalling current plugins should help.\n"),
+ iface_version);
+
+ return NULL;
+ }
+
+ this = (logpcm_decoder_t *) malloc (sizeof (logpcm_decoder_t));
+
+ this->audio_decoder.interface_version = iface_version;
+ this->audio_decoder.can_handle = logpcm_can_handle;
+ this->audio_decoder.init = logpcm_init;
+ this->audio_decoder.decode_data = logpcm_decode_data;
+ this->audio_decoder.reset = logpcm_reset;
+ this->audio_decoder.close = logpcm_close;
+ this->audio_decoder.get_identifier = logpcm_get_id;
+ this->audio_decoder.dispose = logpcm_dispose;
+ this->audio_decoder.priority = 5;
+
+ return (audio_decoder_t *) this;
+}
+
diff --git a/src/xine-engine/buffer.h b/src/xine-engine/buffer.h
index aaeec218f..0c41f4748 100644
--- a/src/xine-engine/buffer.h
+++ b/src/xine-engine/buffer.h
@@ -17,7 +17,7 @@
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*
- * $Id: buffer.h,v 1.66 2002/08/30 14:19:48 f1rmb Exp $
+ * $Id: buffer.h,v 1.67 2002/09/01 04:24:35 tmmm Exp $
*
*
* contents:
@@ -158,6 +158,8 @@ extern "C" {
#define BUF_AUDIO_QCLP 0x03190000
#define BUF_AUDIO_SMJPEG_IMA 0x031A0000
#define BUF_AUDIO_VQA_IMA 0x031B0000
+#define BUF_AUDIO_MULAW 0x031C0000
+#define BUF_AUDIO_ALAW 0x031D0000
/* spu buffer types: */
diff --git a/src/xine-engine/buffer_types.c b/src/xine-engine/buffer_types.c
index d04505a0b..b479db331 100644
--- a/src/xine-engine/buffer_types.c
+++ b/src/xine-engine/buffer_types.c
@@ -17,7 +17,7 @@
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*
- * $Id: buffer_types.c,v 1.39 2002/08/29 06:06:03 tmmm Exp $
+ * $Id: buffer_types.c,v 1.40 2002/09/01 04:24:35 tmmm Exp $
*
*
* contents:
@@ -652,6 +652,24 @@ static audio_db_t audio_db[] = {
BUF_AUDIO_QCLP,
"Qualcomm PureVoice"
},
+{
+ {
+ 0x7,
+ meFOURCC('u', 'l', 'a', 'w'),
+ 0
+ },
+ BUF_AUDIO_MULAW,
+ "mu-law logarithmic PCM"
+},
+{
+ {
+ 0x6,
+ meFOURCC('a', 'l', 'a', 'w'),
+ 0
+ },
+ BUF_AUDIO_ALAW,
+ "A-law logarithmic PCM"
+},
{ { 0 }, 0, "last entry" }
};
generated by cgit v1.2.3 (git 2.25.1) at 2025-04-22 11:35:55 +0000